movenc.c 52.4 KB
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/*
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 * MOV, 3GP, MP4 muxer
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 * Copyright (c) 2003 Thomas Raivio.
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 * Copyright (c) 2004 Gildas Bazin <gbazin at videolan dot org>.
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 *
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 * This file is part of FFmpeg.
 *
 * FFmpeg is free software; you can redistribute it and/or
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 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
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 * version 2.1 of the License, or (at your option) any later version.
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 *
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 * FFmpeg is distributed in the hope that it will be useful,
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 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
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 * License along with FFmpeg; if not, write to the Free Software
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 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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 */
#include "avformat.h"
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#include "riff.h"
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#include "avio.h"
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#include "isom.h"
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#undef NDEBUG
#include <assert.h>

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#define MOV_INDEX_CLUSTER_SIZE 16384
#define globalTimescale 1000

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#define MODE_MP4 0
#define MODE_MOV 1
#define MODE_3GP 2
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#define MODE_PSP 3 // example working PSP command line:
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// ffmpeg -i testinput.avi  -f psp -r 14.985 -s 320x240 -b 768 -ar 24000 -ab 32 M4V00001.MP4
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#define MODE_3G2 4
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typedef struct MOVIentry {
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    unsigned int flags, size;
    uint64_t     pos;
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    unsigned int samplesInChunk;
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    char         key_frame;
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    unsigned int entries;
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    int64_t      cts;
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    int64_t      dts;
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} MOVIentry;

typedef struct MOVIndex {
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    int         mode;
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    int         entry;
    long        timescale;
    long        time;
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    int64_t     trackDuration;
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    long        sampleCount;
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    long        sampleSize;
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    int         hasKeyframes;
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    int         hasBframes;
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    int         language;
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    int         trackID;
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    int         tag;
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    AVCodecContext *enc;

    int         vosLen;
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    uint8_t     *vosData;
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    MOVIentry   *cluster;
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    int         audio_vbr;
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} MOVTrack;

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typedef struct MOVContext {
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    int     mode;
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    int64_t time;
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    int     nb_streams;
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    offset_t mdat_pos;
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    uint64_t mdat_size;
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    long    timescale;
    MOVTrack tracks[MAX_STREAMS];
} MOVContext;

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//FIXME support 64 bit variant with wide placeholders
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static offset_t updateSize (ByteIOContext *pb, offset_t pos)
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{
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    offset_t curpos = url_ftell(pb);
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    url_fseek(pb, pos, SEEK_SET);
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    put_be32(pb, curpos - pos); /* rewrite size */
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    url_fseek(pb, curpos, SEEK_SET);
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    return curpos - pos;
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}

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/* Chunk offset atom */
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static int mov_write_stco_tag(ByteIOContext *pb, MOVTrack* track)
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{
    int i;
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    int mode64 = 0; //   use 32 bit size variant if possible
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    offset_t pos = url_ftell(pb);
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    put_be32(pb, 0); /* size */
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    if (pos > UINT32_MAX) {
        mode64 = 1;
        put_tag(pb, "co64");
    } else
        put_tag(pb, "stco");
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    put_be32(pb, 0); /* version & flags */
    put_be32(pb, track->entry); /* entry count */
    for (i=0; i<track->entry; i++) {
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        if(mode64 == 1)
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            put_be64(pb, track->cluster[i].pos);
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        else
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            put_be32(pb, track->cluster[i].pos);
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    }
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    return updateSize (pb, pos);
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}

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/* Sample size atom */
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static int mov_write_stsz_tag(ByteIOContext *pb, MOVTrack* track)
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{
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    int equalChunks = 1;
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    int i, j, entries = 0, tst = -1, oldtst = -1;
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    offset_t pos = url_ftell(pb);
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    put_be32(pb, 0); /* size */
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    put_tag(pb, "stsz");
    put_be32(pb, 0); /* version & flags */

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    for (i=0; i<track->entry; i++) {
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        tst = track->cluster[i].size/track->cluster[i].entries;
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        if(oldtst != -1 && tst != oldtst) {
            equalChunks = 0;
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        }
        oldtst = tst;
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        entries += track->cluster[i].entries;
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    }
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    if (equalChunks) {
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        int sSize = track->cluster[0].size/track->cluster[0].entries;
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        put_be32(pb, sSize); // sample size
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        put_be32(pb, entries); // sample count
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    }
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    else {
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        put_be32(pb, 0); // sample size
        put_be32(pb, entries); // sample count
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        for (i=0; i<track->entry; i++) {
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            for ( j=0; j<track->cluster[i].entries; j++) {
                put_be32(pb, track->cluster[i].size /
                         track->cluster[i].entries);
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            }
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        }
    }
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    return updateSize (pb, pos);
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}

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/* Sample to chunk atom */
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static int mov_write_stsc_tag(ByteIOContext *pb, MOVTrack* track)
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{
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    int index = 0, oldval = -1, i;
    offset_t entryPos, curpos;
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    offset_t pos = url_ftell(pb);
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    put_be32(pb, 0); /* size */
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    put_tag(pb, "stsc");
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    put_be32(pb, 0); // version & flags
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    entryPos = url_ftell(pb);
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    put_be32(pb, track->entry); // entry count
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    for (i=0; i<track->entry; i++) {
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        if(oldval != track->cluster[i].samplesInChunk)
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        {
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            put_be32(pb, i+1); // first chunk
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            put_be32(pb, track->cluster[i].samplesInChunk); // samples per chunk
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            put_be32(pb, 0x1); // sample description index
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            oldval = track->cluster[i].samplesInChunk;
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            index++;
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        }
    }
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    curpos = url_ftell(pb);
    url_fseek(pb, entryPos, SEEK_SET);
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    put_be32(pb, index); // rewrite size
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    url_fseek(pb, curpos, SEEK_SET);
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    return updateSize (pb, pos);
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}

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/* Sync sample atom */
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static int mov_write_stss_tag(ByteIOContext *pb, MOVTrack* track)
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{
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    offset_t curpos, entryPos;
    int i, index = 0;
    offset_t pos = url_ftell(pb);
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    put_be32(pb, 0); // size
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    put_tag(pb, "stss");
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    put_be32(pb, 0); // version & flags
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    entryPos = url_ftell(pb);
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    put_be32(pb, track->entry); // entry count
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    for (i=0; i<track->entry; i++) {
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        if(track->cluster[i].key_frame == 1) {
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            put_be32(pb, i+1);
            index++;
        }
    }
    curpos = url_ftell(pb);
    url_fseek(pb, entryPos, SEEK_SET);
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    put_be32(pb, index); // rewrite size
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    url_fseek(pb, curpos, SEEK_SET);
    return updateSize (pb, pos);
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}

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static int mov_write_amr_tag(ByteIOContext *pb, MOVTrack *track)
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{
    put_be32(pb, 0x11); /* size */
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    if (track->mode == MODE_MOV) put_tag(pb, "samr");
    else                         put_tag(pb, "damr");
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    put_tag(pb, "FFMP");
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    put_byte(pb, 0); /* decoder version */
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    put_be16(pb, 0x81FF); /* Mode set (all modes for AMR_NB) */
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    put_byte(pb, 0x00); /* Mode change period (no restriction) */
    put_byte(pb, 0x01); /* Frames per sample */
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    return 0x11;
}

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static int mov_write_enda_tag(ByteIOContext *pb)
{
    put_be32(pb, 10);
    put_tag(pb, "enda");
    put_be16(pb, 1); /* little endian */
    return 10;
}

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static unsigned int descrLength(unsigned int len)
{
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    int i;
    for(i=1; len>>(7*i); i++);
    return len + 1 + i;
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}

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static void putDescr(ByteIOContext *pb, int tag, unsigned int size)
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{
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    int i= descrLength(size) - size - 2;
    put_byte(pb, tag);
    for(; i>0; i--)
        put_byte(pb, (size>>(7*i)) | 0x80);
    put_byte(pb, size & 0x7F);
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}

static int mov_write_esds_tag(ByteIOContext *pb, MOVTrack* track) // Basic
{
    offset_t pos = url_ftell(pb);
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    int decoderSpecificInfoLen = track->vosLen ? descrLength(track->vosLen):0;
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    put_be32(pb, 0);               // size
    put_tag(pb, "esds");
    put_be32(pb, 0);               // Version

    // ES descriptor
    putDescr(pb, 0x03, 3 + descrLength(13 + decoderSpecificInfoLen) +
             descrLength(1));
    put_be16(pb, track->trackID);
    put_byte(pb, 0x00);            // flags (= no flags)

    // DecoderConfig descriptor
    putDescr(pb, 0x04, 13 + decoderSpecificInfoLen);

    // Object type indication
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    put_byte(pb, codec_get_tag(ff_mp4_obj_type, track->enc->codec_id));
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    // the following fields is made of 6 bits to identify the streamtype (4 for video, 5 for audio)
    // plus 1 bit to indicate upstream and 1 bit set to 1 (reserved)
    if(track->enc->codec_type == CODEC_TYPE_AUDIO)
        put_byte(pb, 0x15);            // flags (= Audiostream)
    else
        put_byte(pb, 0x11);            // flags (= Visualstream)

    put_byte(pb,  track->enc->rc_buffer_size>>(3+16));             // Buffersize DB (24 bits)
    put_be16(pb, (track->enc->rc_buffer_size>>3)&0xFFFF);          // Buffersize DB

    put_be32(pb, FFMAX(track->enc->bit_rate, track->enc->rc_max_rate));     // maxbitrate  (FIXME should be max rate in any 1 sec window)
    if(track->enc->rc_max_rate != track->enc->rc_min_rate || track->enc->rc_min_rate==0)
        put_be32(pb, 0);     // vbr
    else
        put_be32(pb, track->enc->rc_max_rate);     // avg bitrate

    if (track->vosLen)
    {
        // DecoderSpecific info descriptor
        putDescr(pb, 0x05, track->vosLen);
        put_buffer(pb, track->vosData, track->vosLen);
    }


    // SL descriptor
    putDescr(pb, 0x06, 1);
    put_byte(pb, 0x02);
    return updateSize (pb, pos);
}

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static int mov_write_wave_tag(ByteIOContext *pb, MOVTrack* track)
{
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    offset_t pos = url_ftell(pb);
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    put_be32(pb, 0);     /* size */
    put_tag(pb, "wave");

    put_be32(pb, 12);    /* size */
    put_tag(pb, "frma");
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    put_le32(pb, track->tag);
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    if (track->enc->codec_id == CODEC_ID_AAC) {
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        /* useless atom needed by mplayer, ipod, not needed by quicktime */
        put_be32(pb, 12); /* size */
        put_tag(pb, "mp4a");
        put_be32(pb, 0);
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        mov_write_esds_tag(pb, track);
    } else if (track->enc->codec_id == CODEC_ID_PCM_S24LE ||
               track->enc->codec_id == CODEC_ID_PCM_S32LE) {
        mov_write_enda_tag(pb);
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    } else if (track->enc->codec_id == CODEC_ID_AMR_NB) {
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        mov_write_amr_tag(pb, track);
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    }
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    put_be32(pb, 8);     /* size */
    put_be32(pb, 0);     /* null tag */

    return updateSize (pb, pos);
}

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static int mov_write_audio_tag(ByteIOContext *pb, MOVTrack* track)
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{
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    offset_t pos = url_ftell(pb);
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    int version = track->mode == MODE_MOV &&
        (track->audio_vbr ||
         track->enc->codec_id == CODEC_ID_PCM_S32LE ||
         track->enc->codec_id == CODEC_ID_PCM_S24LE);
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    put_be32(pb, 0); /* size */
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    put_le32(pb, track->tag); // store it byteswapped
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    put_be32(pb, 0); /* Reserved */
    put_be16(pb, 0); /* Reserved */
    put_be16(pb, 1); /* Data-reference index, XXX  == 1 */
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    /* SoundDescription */
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    put_be16(pb, version); /* Version */
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    put_be16(pb, 0); /* Revision level */
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    put_be32(pb, 0); /* Reserved */

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    if (track->mode == MODE_MOV) {
        put_be16(pb, track->enc->channels);
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        if (track->enc->codec_id == CODEC_ID_PCM_U8 ||
            track->enc->codec_id == CODEC_ID_PCM_S8)
            put_be16(pb, 8); /* bits per sample */
        else
            put_be16(pb, 16);
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        put_be16(pb, track->audio_vbr ? -2 : 0); /* compression ID */
    } else { /* reserved for mp4/3gp */
        put_be16(pb, 2);
        put_be16(pb, 16);
        put_be16(pb, 0);
    }
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    put_be16(pb, 0); /* packet size (= 0) */
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    put_be16(pb, track->timescale); /* Time scale */
    put_be16(pb, 0); /* Reserved */

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    if(version == 1) { /* SoundDescription V1 extended info */
        put_be32(pb, track->enc->frame_size); /* Samples per packet */
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        put_be32(pb, track->sampleSize / track->enc->channels); /* Bytes per packet */
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        put_be32(pb, track->sampleSize); /* Bytes per frame */
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        put_be32(pb, 2); /* Bytes per sample */
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    }

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    if(track->mode == MODE_MOV &&
       (track->enc->codec_id == CODEC_ID_AAC ||
        track->enc->codec_id == CODEC_ID_AMR_NB ||
        track->enc->codec_id == CODEC_ID_PCM_S24LE ||
        track->enc->codec_id == CODEC_ID_PCM_S32LE))
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        mov_write_wave_tag(pb, track);
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    else if(track->enc->codec_id == CODEC_ID_AAC)
        mov_write_esds_tag(pb, track);
    else if(track->enc->codec_id == CODEC_ID_AMR_NB)
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        mov_write_amr_tag(pb, track);
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    return updateSize (pb, pos);
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}

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static int mov_write_d263_tag(ByteIOContext *pb)
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{
    put_be32(pb, 0xf); /* size */
    put_tag(pb, "d263");
    put_tag(pb, "FFMP");
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    put_byte(pb, 0); /* decoder version */
    /* FIXME use AVCodecContext level/profile, when encoder will set values */
    put_byte(pb, 0xa); /* level */
    put_byte(pb, 0); /* profile */
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    return 0xf;
}

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/* TODO: No idea about these values */
static int mov_write_svq3_tag(ByteIOContext *pb)
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{
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    put_be32(pb, 0x15);
    put_tag(pb, "SMI ");
    put_tag(pb, "SEQH");
    put_be32(pb, 0x5);
    put_be32(pb, 0xe2c0211d);
    put_be32(pb, 0xc0000000);
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    put_byte(pb, 0);
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    return 0x15;
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}

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static uint8_t *avc_find_startcode( uint8_t *p, uint8_t *end )
{
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    uint8_t *a = p + 4 - ((long)p & 3);
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    for( end -= 3; p < a && p < end; p++ ) {
        if( p[0] == 0 && p[1] == 0 && p[2] == 1 )
            return p;
    }

    for( end -= 3; p < end; p += 4 ) {
        uint32_t x = *(uint32_t*)p;
//      if( (x - 0x01000100) & (~x) & 0x80008000 ) // little endian
//      if( (x - 0x00010001) & (~x) & 0x00800080 ) // big endian
        if( (x - 0x01010101) & (~x) & 0x80808080 ) { // generic
            if( p[1] == 0 ) {
                if( p[0] == 0 && p[2] == 1 )
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                    return p-1;
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                if( p[2] == 0 && p[3] == 1 )
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                    return p;
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            }
            if( p[3] == 0 ) {
                if( p[2] == 0 && p[4] == 1 )
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                    return p+1;
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                if( p[4] == 0 && p[5] == 1 )
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                    return p+2;
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            }
        }
    }

    for( end += 3; p < end; p++ ) {
        if( p[0] == 0 && p[1] == 0 && p[2] == 1 )
            return p;
    }

    return end + 3;
}

static void avc_parse_nal_units(uint8_t **buf, int *size)
{
    ByteIOContext pb;
    uint8_t *p = *buf;
    uint8_t *end = p + *size;
    uint8_t *nal_start, *nal_end;

    url_open_dyn_buf(&pb);
    nal_start = avc_find_startcode(p, end);
    while (nal_start < end) {
        while(!*(nal_start++));
        nal_end = avc_find_startcode(nal_start, end);
        put_be32(&pb, nal_end - nal_start);
        put_buffer(&pb, nal_start, nal_end - nal_start);
        nal_start = nal_end;
    }
    av_freep(buf);
    *size = url_close_dyn_buf(&pb, buf);
}

static int mov_write_avcc_tag(ByteIOContext *pb, MOVTrack *track)
{
    offset_t pos = url_ftell(pb);

    put_be32(pb, 0);
    put_tag(pb, "avcC");
    if (track->vosLen > 6) {
        /* check for h264 start code */
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        if (AV_RB32(track->vosData) == 0x00000001) {
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            uint8_t *buf, *end;
            uint32_t sps_size=0, pps_size=0;
            uint8_t *sps=0, *pps=0;

            avc_parse_nal_units(&track->vosData, &track->vosLen);
            buf = track->vosData;
            end = track->vosData + track->vosLen;

            /* look for sps and pps */
            while (buf < end) {
                unsigned int size;
                uint8_t nal_type;
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                size = AV_RB32(buf);
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                nal_type = buf[4] & 0x1f;
                if (nal_type == 7) { /* SPS */
                    sps = buf + 4;
                    sps_size = size;
                } else if (nal_type == 8) { /* PPS */
                    pps = buf + 4;
                    pps_size = size;
                }
                buf += size + 4;
            }
            assert(sps);
            assert(pps);
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            put_byte(pb, 1); /* version */
            put_byte(pb, sps[1]); /* profile */
            put_byte(pb, sps[2]); /* profile compat */
            put_byte(pb, sps[3]); /* level */
            put_byte(pb, 0xff); /* 6 bits reserved (111111) + 2 bits nal size length - 1 (11) */
            put_byte(pb, 0xe1); /* 3 bits reserved (111) + 5 bits number of sps (00001) */

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            put_be16(pb, sps_size);
            put_buffer(pb, sps, sps_size);
            put_byte(pb, 1); /* number of pps */
            put_be16(pb, pps_size);
            put_buffer(pb, pps, pps_size);
        } else {
            put_buffer(pb, track->vosData, track->vosLen);
        }
    }
    return updateSize(pb, pos);
}

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static int mov_find_video_codec_tag(AVFormatContext *s, MOVTrack *track)
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{
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    int tag = track->enc->codec_tag;
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    if (!tag) {
        if (track->enc->codec_id == CODEC_ID_DVVIDEO) {
            if (track->enc->height == 480) { /* NTSC */
                if (track->enc->pix_fmt == PIX_FMT_YUV422P)
                    tag = MKTAG('d', 'v', '5', 'n');
                else
                    tag = MKTAG('d', 'v', 'c', ' ');
            } else { /* assume PAL */
                if (track->enc->pix_fmt == PIX_FMT_YUV422P)
                    tag = MKTAG('d', 'v', '5', 'p');
                else if (track->enc->pix_fmt == PIX_FMT_YUV420P)
                    tag = MKTAG('d', 'v', 'c', 'p');
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                else
                    tag = MKTAG('d', 'v', 'p', 'p');
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            }
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        } else if (track->enc->codec_id == CODEC_ID_H263) {
            if (track->mode == MODE_MOV)
                tag = MKTAG('h', '2', '6', '3');
            else
                tag = MKTAG('s', '2', '6', '3');
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        } else {
            tag = codec_get_tag(codec_movvideo_tags, track->enc->codec_id);
        }
    }
    // if no mac fcc found, try with Microsoft tags
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    if (!tag) {
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        tag = codec_get_tag(codec_bmp_tags, track->enc->codec_id);
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        if (tag) {
            av_log(s, AV_LOG_INFO, "Warning, using MS style video codec tag, the file may be unplayable!\n");
        }
    }
    assert(tag);
    return tag;
}

static int mov_find_audio_codec_tag(AVFormatContext *s, MOVTrack *track)
{
    int tag = track->enc->codec_tag;
    if (!tag) {
        tag = codec_get_tag(codec_movaudio_tags, track->enc->codec_id);
    }
    // if no mac fcc found, try with Microsoft tags
    if (!tag) {
        int ms_tag = codec_get_tag(codec_wav_tags, track->enc->codec_id);
        if (ms_tag) {
            tag = MKTAG('m', 's', ((ms_tag >> 8) & 0xff), (ms_tag & 0xff));
            av_log(s, AV_LOG_INFO, "Warning, using MS style audio codec tag, the file may be unplayable!\n");
        }
    }
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    assert(tag);
    return tag;
}

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static int mov_write_video_tag(ByteIOContext *pb, MOVTrack* track)
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{
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    offset_t pos = url_ftell(pb);
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    char compressor_name[32];
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    put_be32(pb, 0); /* size */
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    put_le32(pb, track->tag); // store it byteswapped
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    put_be32(pb, 0); /* Reserved */
    put_be16(pb, 0); /* Reserved */
    put_be16(pb, 1); /* Data-reference index */

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    put_be16(pb, 0); /* Codec stream version */
    put_be16(pb, 0); /* Codec stream revision (=0) */
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    if (track->mode == MODE_MOV) {
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        put_tag(pb, "FFMP"); /* Vendor */
        if(track->enc->codec_id == CODEC_ID_RAWVIDEO) {
            put_be32(pb, 0); /* Temporal Quality */
            put_be32(pb, 0x400); /* Spatial Quality = lossless*/
        } else {
            put_be32(pb, 0x200); /* Temporal Quality = normal */
            put_be32(pb, 0x200); /* Spatial Quality = normal */
        }
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    } else {
        put_be32(pb, 0); /* Reserved */
        put_be32(pb, 0); /* Reserved */
        put_be32(pb, 0); /* Reserved */
    }
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    put_be16(pb, track->enc->width); /* Video width */
    put_be16(pb, track->enc->height); /* Video height */
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    put_be32(pb, 0x00480000); /* Horizontal resolution 72dpi */
    put_be32(pb, 0x00480000); /* Vertical resolution 72dpi */
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    put_be32(pb, 0); /* Data size (= 0) */
    put_be16(pb, 1); /* Frame count (= 1) */
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    memset(compressor_name,0,32);
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    /* FIXME not sure, ISO 14496-1 draft where it shall be set to 0 */
    if (track->mode == MODE_MOV && track->enc->codec && track->enc->codec->name)
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        strncpy(compressor_name,track->enc->codec->name,31);
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    put_byte(pb, strlen(compressor_name));
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    put_buffer(pb, compressor_name, 31);
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    put_be16(pb, 0x18); /* Reserved */
    put_be16(pb, 0xffff); /* Reserved */
    if(track->enc->codec_id == CODEC_ID_MPEG4)
        mov_write_esds_tag(pb, track);
    else if(track->enc->codec_id == CODEC_ID_H263)
        mov_write_d263_tag(pb);
    else if(track->enc->codec_id == CODEC_ID_SVQ3)
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        mov_write_svq3_tag(pb);
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    else if(track->enc->codec_id == CODEC_ID_H264)
        mov_write_avcc_tag(pb, track);
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    return updateSize (pb, pos);
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}

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static int mov_write_stsd_tag(ByteIOContext *pb, MOVTrack* track)
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{
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    offset_t pos = url_ftell(pb);
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    put_be32(pb, 0); /* size */
    put_tag(pb, "stsd");
    put_be32(pb, 0); /* version & flags */
    put_be32(pb, 1); /* entry count */
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    if (track->enc->codec_type == CODEC_TYPE_VIDEO)
        mov_write_video_tag(pb, track);
    else if (track->enc->codec_type == CODEC_TYPE_AUDIO)
        mov_write_audio_tag(pb, track);
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    return updateSize(pb, pos);
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}

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static int mov_write_ctts_tag(ByteIOContext *pb, MOVTrack* track)
{
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    MOV_stts_t *ctts_entries;
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    uint32_t entries = 0;
    uint32_t atom_size;
    int i;

    ctts_entries = av_malloc((track->entry + 1) * sizeof(*ctts_entries)); /* worst case */
    ctts_entries[0].count = 1;
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    ctts_entries[0].duration = track->cluster[0].cts;
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    for (i=1; i<track->entry; i++) {
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        if (track->cluster[i].cts == ctts_entries[entries].duration) {
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            ctts_entries[entries].count++; /* compress */
        } else {
            entries++;
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            ctts_entries[entries].duration = track->cluster[i].cts;
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            ctts_entries[entries].count = 1;
        }
    }
    entries++; /* last one */
    atom_size = 16 + (entries * 8);
    put_be32(pb, atom_size); /* size */
    put_tag(pb, "ctts");
    put_be32(pb, 0); /* version & flags */
    put_be32(pb, entries); /* entry count */
    for (i=0; i<entries; i++) {
        put_be32(pb, ctts_entries[i].count);
        put_be32(pb, ctts_entries[i].duration);
    }
    av_free(ctts_entries);
    return atom_size;
}

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/* Time to sample atom */
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static int mov_write_stts_tag(ByteIOContext *pb, MOVTrack* track)
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{
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    MOV_stts_t *stts_entries;
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    uint32_t entries = -1;
    uint32_t atom_size;
    int i;

    if (track->enc->codec_type == CODEC_TYPE_AUDIO && !track->audio_vbr) {
        stts_entries = av_malloc(sizeof(*stts_entries)); /* one entry */
        stts_entries[0].count = track->sampleCount;
        stts_entries[0].duration = 1;
        entries = 1;
    } else {
        stts_entries = av_malloc(track->entry * sizeof(*stts_entries)); /* worst case */
        for (i=0; i<track->entry; i++) {
            int64_t duration = i + 1 == track->entry ?
                track->trackDuration - track->cluster[i].dts + track->cluster[0].dts : /* readjusting */
                track->cluster[i+1].dts - track->cluster[i].dts;
            if (i && duration == stts_entries[entries].duration) {
                stts_entries[entries].count++; /* compress */
            } else {
                entries++;
                stts_entries[entries].duration = duration;
                stts_entries[entries].count = 1;
            }
        }
        entries++; /* last one */
    }
    atom_size = 16 + (entries * 8);
    put_be32(pb, atom_size); /* size */
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    put_tag(pb, "stts");
    put_be32(pb, 0); /* version & flags */
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    put_be32(pb, entries); /* entry count */
    for (i=0; i<entries; i++) {
        put_be32(pb, stts_entries[i].count);
        put_be32(pb, stts_entries[i].duration);
    }
    av_free(stts_entries);
    return atom_size;
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}

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static int mov_write_dref_tag(ByteIOContext *pb)
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{
    put_be32(pb, 28); /* size */
    put_tag(pb, "dref");
    put_be32(pb, 0); /* version & flags */
    put_be32(pb, 1); /* entry count */

    put_be32(pb, 0xc); /* size */
    put_tag(pb, "url ");
    put_be32(pb, 1); /* version & flags */

    return 28;
}

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static int mov_write_stbl_tag(ByteIOContext *pb, MOVTrack* track)
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{
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    offset_t pos = url_ftell(pb);
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    put_be32(pb, 0); /* size */
    put_tag(pb, "stbl");
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    mov_write_stsd_tag(pb, track);
    mov_write_stts_tag(pb, track);
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    if (track->enc->codec_type == CODEC_TYPE_VIDEO &&
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        track->hasKeyframes < track->entry)
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        mov_write_stss_tag(pb, track);
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    if (track->enc->codec_type == CODEC_TYPE_VIDEO &&
        track->hasBframes)
        mov_write_ctts_tag(pb, track);
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    mov_write_stsc_tag(pb, track);
    mov_write_stsz_tag(pb, track);
    mov_write_stco_tag(pb, track);
    return updateSize(pb, pos);
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}

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static int mov_write_dinf_tag(ByteIOContext *pb)
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{
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    offset_t pos = url_ftell(pb);
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    put_be32(pb, 0); /* size */
    put_tag(pb, "dinf");
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    mov_write_dref_tag(pb);
    return updateSize(pb, pos);
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}

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static int mov_write_smhd_tag(ByteIOContext *pb)
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{
    put_be32(pb, 16); /* size */
    put_tag(pb, "smhd");
    put_be32(pb, 0); /* version & flags */
    put_be16(pb, 0); /* reserved (balance, normally = 0) */
    put_be16(pb, 0); /* reserved */
    return 16;
}

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static int mov_write_vmhd_tag(ByteIOContext *pb)
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{
    put_be32(pb, 0x14); /* size (always 0x14) */
    put_tag(pb, "vmhd");
    put_be32(pb, 0x01); /* version & flags */
    put_be64(pb, 0); /* reserved (graphics mode = copy) */
    return 0x14;
}

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static int mov_write_hdlr_tag(ByteIOContext *pb, MOVTrack* track)
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{
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    const char *descr, *hdlr, *hdlr_type;
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    offset_t pos = url_ftell(pb);
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    if (!track) { /* no media --> data handler */
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        hdlr = "dhlr";
        hdlr_type = "url ";
        descr = "DataHandler";
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    } else {
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        hdlr = (track->mode == MODE_MOV) ? "mhlr" : "\0\0\0\0";
        if (track->enc->codec_type == CODEC_TYPE_VIDEO) {
            hdlr_type = "vide";
            descr = "VideoHandler";
        } else {
            hdlr_type = "soun";
            descr = "SoundHandler";
        }
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    }
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    put_be32(pb, 0); /* size */
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    put_tag(pb, "hdlr");
    put_be32(pb, 0); /* Version & flags */
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    put_buffer(pb, hdlr, 4); /* handler */
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    put_tag(pb, hdlr_type); /* handler type */
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    put_be32(pb ,0); /* reserved */
    put_be32(pb ,0); /* reserved */
    put_be32(pb ,0); /* reserved */
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    put_byte(pb, strlen(descr)); /* string counter */
    put_buffer(pb, descr, strlen(descr)); /* handler description */
    return updateSize(pb, pos);
}

static int mov_write_minf_tag(ByteIOContext *pb, MOVTrack* track)
{
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    offset_t pos = url_ftell(pb);
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    put_be32(pb, 0); /* size */
    put_tag(pb, "minf");
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    if(track->enc->codec_type == CODEC_TYPE_VIDEO)
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        mov_write_vmhd_tag(pb);
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    else
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        mov_write_smhd_tag(pb);
    if (track->mode == MODE_MOV) /* FIXME: Why do it for MODE_MOV only ? */
        mov_write_hdlr_tag(pb, NULL);
    mov_write_dinf_tag(pb);
    mov_write_stbl_tag(pb, track);
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    return updateSize(pb, pos);
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}

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static int mov_write_mdhd_tag(ByteIOContext *pb, MOVTrack* track)
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{
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    int version = track->trackDuration < INT32_MAX ? 0 : 1;

    (version == 1) ? put_be32(pb, 44) : put_be32(pb, 32); /* size */
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    put_tag(pb, "mdhd");
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    put_byte(pb, version);
    put_be24(pb, 0); /* flags */
    if (version == 1) {
        put_be64(pb, track->time);
        put_be64(pb, track->time);
    } else {
        put_be32(pb, track->time); /* creation time */
        put_be32(pb, track->time); /* modification time */
    }
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    put_be32(pb, track->timescale); /* time scale (sample rate for audio) */
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    (version == 1) ? put_be64(pb, track->trackDuration) : put_be32(pb, track->trackDuration); /* duration */
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    put_be16(pb, track->language); /* language */